Intermittent mechanism



Patented Aug. 9,1921,

2 SHEETS-SHEET 1- W. HUCAL.

INTERMITTENT MECHANISM.

APPLICATION FILED JUNE 11. 1919.

W. HUCAL.

INTERMITTENT MECHANISM.

APPLICATION FILED JUNE 17. 1919.

1 387,054. Patented Aug. 9, 192 1.

2 SHEETS-SHEET 2.

PATENT OFFICE.

WASYL HUCAL, or CHICAGO, ILLINOIS.

" INTEBMITTENT MECHANISM.

Specification of Letters Patent.

Patented Aug. 9, 1921.

Application filed June 17, 1919. Serial No. 304,519.

To all whom it may concern:

Be it, known that I, WASYL .HUOAL, a citizen of the United States, residing at Chicago, in the countyof Cook and State of Illinois, have invented certain new and useful Improvements in Intermittent Mechanism, of which the following is a specification. I

The invention has for an object toprovlde an intermittent mechanism suitable for use with moving picture apparatus, either for projecting or in photography, which will be positive in action, silent in operation and involve a comparatively small amount ofpower for its operation. It'is an important aim of the invention to present such a mechanism which will have a minimum number of parts andbe liable in aminimum degree to loss of efficiency through wear. It is also an aim to give such a mechanism which may be produced in a very compact form. Another aim is to provide a mechanism of this character which may be readily used upon machines such as are now generally employed. I 3

Additional objects, advantages and fea-, tures of invention will appear from the con struction, arrangement, and combination of parts involved in the invention, one embodiment of which is described herein and shown in thedrawings, wherein,

Figure 1 is an elevational View of the mechanism in its casing, with part of the casing broken away.

Fig. 2 is a top view thereof.

Fig. 3 is a cross sectional view on the line 33 of Fig. 1.

Fig. 4 is an edge view of the disk 11,

Fig. 5 is a similar view of a modification of the disk.

There is illustratedacase 10 of circular form, within which a cam disk 11 is revolubly mounted, being carried upon a shaft 12 j ournaled in the back wall 13 and cover plate 14 of the case. The back wall 13 forms a part of the main body of the case, which includes a cylindrical wall portion 15 inte ral with the wall 13, and carried upon this body portion there is amounting arm 16 having a dove tail channel 17 thereacross, adapted to receive slidabl therein a correspondingly formed stud rail or other element as may be provided for the mounting of the intermittent mechanism. Other means may of course be employed for mounting the case if desired.

The disk 11 is secured upon the shaft 12 and is provided with a cam groove or chan nel 18 in its periphery, rectangular in cross section, and for its major part having opposite sides in planes at right angles to the axis of the shaft 12, the body of the disk projecting on each side of the groove in the form of flanges 19, as illustrated in Fig. 3. A shaft 20 is mounted in the casing to lie medially within this-groove, being located upon a horizontal axis in the lower part of the case in the present instance, the body of the casing being open at the lower side and having extensions 21-22 upon which there is secured an intermittent retainer cap 23, the bearing for the shaft 20 being formed in, the opposedvfaces of the cap and extensions 21-22. Fixed upon the shaft 20 in a. plane at right angles thereto and coincident. with the axis of the shaft 12, there is a driven-cam block 24 rectangular in section at right angles to its shaft and of a size to fittsnugly in the groove 18. Its outer faces are slightly curved convexly from one side to the other. At one side. of the disk, the

groove is given a spiral form, as though it had been twisted a quarter turn, so that the angular junction between the bottom and side of the groove at one side becomes slightly inclined inwardly toward the axis of the cam disk, and also toward the opposite side of the groove, in the form of a spiral having a radius equal to the radius of the corners of the block 24.- with respect to its axis, and having an axis concentric with the shaft 12 on a-radius equal to the dis-' tance between the axis of the shaft 12 and the axis of the shaft 20. At the same time, the bottom face and one side face of the groove assume a form corresponding to that of an archimedean screw having a curved axis, instead of a rectilinear axis. This involves the deflection'of the side of the groove outwardly into the flange 19 for a distance, the continuation of the surface of one side of the flange in one direction forming the bottom of the groove at the far end of the ment as would be obtained by the first form described.

The disk 11 is formed with a semi-spherical recess 25 at one side from which projects a hub 26, the back of the ease receiving the outer part of the hub snugly for hearing. On the back wall 13 of the case there is formed a cylindrical wall 27 projecting into the recess 25 and in close spaced relation to the hub 26. The wall 27 stops short of the bottom of the recess 25. The back wall 13 and plate 1% each lies in close spaced relation to the adjacent face of the disk.

The shaft 20 for the intermittent drive does not require to be very strong for the amount of power to be transmitted, but on account of the abrupt action of the cam on the member 21 a severe side thrust is involved, and therefore a very heavy part 28 is formed on the shaft 20 titted in suitable b .aring portions in the cap 23.

The shaft 20 is either connected to the shaft oi the intermittent sprocket in the moving picture mechanism, or the intermittent sprocket mounted directly upon the shaft 20 in the moving picture mechanism.

It will be seen that the device gives the advantage of a very large bearing area upon the driven cam whereby the rotative move ment imparted thereto may be quickly checked without excessive wear upon the engaging surfaces or liability of fracture, and the character of the device is such as to r idily enable its operation in oil, the casing being filled with oil ordinarily.

The wall may be cylindrical throughout, and the cap plate 28 formed with a slight medial enlargement 28 in which the block 2% may rotate.

The parts all have a good oil-tight fit, and the construction permits the case to be supplied with sufficient oil to partly or completely fill it, reducing wear, sound and vibration.

lVhat is claimed:

A device of the character described comprising a circular case having a back body portion and integral cylindrical wall, an oil-tight cover plate thereon, a shaft concentrically revoluble in the case, a cam thereon having a periphe'al groove with partly spiral term in parts, a second member engaged in'the groove for intermittent rotation thereby under rotation of the cam, said second member being revoluble on an axis at right angles to that of the cam, and having a shaft extended in each direction on its axis, and enlarged at its inner parts, said case having an opening in the wall, for lateral movement of the second member into and out of engagement with the cam, a cap member to close the opening having hearing parts to engage the enlarged parts of the last named shaft, the case and cap having parts to form an oil-tight closure around the shaft.

In testimony whereof I have ailixcd my signature in presence of two witnesses.

WASYL l-IUCAL. lVitnesses W. C. THOMPSON, MARY PARIS. 

